EP4331774A1 - Machine-outil avec un dispositif de découplage - Google Patents

Machine-outil avec un dispositif de découplage Download PDF

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Publication number
EP4331774A1
EP4331774A1 EP22192588.6A EP22192588A EP4331774A1 EP 4331774 A1 EP4331774 A1 EP 4331774A1 EP 22192588 A EP22192588 A EP 22192588A EP 4331774 A1 EP4331774 A1 EP 4331774A1
Authority
EP
European Patent Office
Prior art keywords
housing
assembly
decoupling device
machine tool
decoupling
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP22192588.6A
Other languages
German (de)
English (en)
Inventor
Mengan GONG
Adrian Steingruber
Rory Britz
Thomas Hofbrucker
Joshua Fleck
Matthias Heller
Ulrich Mandel
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hilti AG
Original Assignee
Hilti AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Hilti AG filed Critical Hilti AG
Priority to EP22192588.6A priority Critical patent/EP4331774A1/fr
Priority to EP23751924.4A priority patent/EP4580837A1/fr
Priority to CN202380050436.9A priority patent/CN119403651A/zh
Priority to PCT/EP2023/071436 priority patent/WO2024046695A1/fr
Publication of EP4331774A1 publication Critical patent/EP4331774A1/fr
Withdrawn legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25D—PERCUSSIVE TOOLS
    • B25D17/00—Details of, or accessories for, portable power-driven percussive tools
    • B25D17/24—Damping the reaction force
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25F—COMBINATION OR MULTI-PURPOSE TOOLS NOT OTHERWISE PROVIDED FOR; DETAILS OR COMPONENTS OF PORTABLE POWER-DRIVEN TOOLS NOT PARTICULARLY RELATED TO THE OPERATIONS PERFORMED AND NOT OTHERWISE PROVIDED FOR
    • B25F5/00—Details or components of portable power-driven tools not particularly related to the operations performed and not otherwise provided for
    • B25F5/006—Vibration damping means
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25D—PERCUSSIVE TOOLS
    • B25D2222/00—Materials of the tool or the workpiece
    • B25D2222/54—Plastics
    • B25D2222/57—Elastomers, e.g. rubber
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25D—PERCUSSIVE TOOLS
    • B25D2250/00—General details of portable percussive tools; Components used in portable percussive tools
    • B25D2250/121—Housing details
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25D—PERCUSSIVE TOOLS
    • B25D2250/00—General details of portable percussive tools; Components used in portable percussive tools
    • B25D2250/245—Spatial arrangement of components of the tool relative to each other
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25D—PERCUSSIVE TOOLS
    • B25D2250/00—General details of portable percussive tools; Components used in portable percussive tools
    • B25D2250/371—Use of springs

Definitions

  • the present invention relates to a machine tool, in particular a drill and/or chisel hammer, according to the type defined in more detail in the preamble of patent claim 1.
  • a drill and/or chisel hammer which has an outer housing and an inner housing.
  • the inner housing is arranged in the outer housing, the inner housing having a drive unit and an impact unit.
  • a vibration damping unit with a vibration damping element for damping vibrations occurring during operation is provided, by means of which a main handle connected to the outer housing is decoupled from the inner housing.
  • the inner housing is rotatably mounted relative to the outer housing about an axis of rotation arranged in the area of an instantaneous pole of the impact mechanism unit.
  • the mobility of the inner housing relative to the outer housing is limited to the axis of rotation, which is arranged in the area of the instantaneous pole of the impact mechanism unit.
  • the instantaneous pole cannot be determined exactly and can fluctuate during operation of the machine tool.
  • the damping of the outer housing compared to the inner housing is reduced in this case.
  • a machine tool in particular a hammer drill or chisel hammer, is provided with a housing having a grip area and an assembly comprising a striking mechanism and a drive device, the assembly being arranged essentially within the housing and being arranged to be movable relative to the housing, with a center of gravity of the
  • the assembly is arranged at a distance from an impact axis defining a longitudinal direction, with at least one front one relative to the longitudinal axis Decoupling device and at least one rear decoupling device are provided, the decoupling devices being operatively connected on the one hand to the housing and on the other hand to the assembly.
  • the at least one rear decoupling device is designed to enable movement of the assembly relative to the housing in all three spatial directions and has spring properties and/or damping properties in all three spatial directions.
  • a machine tool designed according to the invention has the advantage that the housing is protected to the desired extent in all operating states of the machine tool against vibrations, oscillations and the like occurring in the area of the assembly during operation of the machine tool and the vibrations occurring in this area are dampened to the desired extent.
  • the rear decoupling device or anti-vibration device has spring properties and/or damping properties in all spatial directions of a Cartesian coordinate system. Vibrations are effectively reduced both in a chiseling operation, in which a chisel connected to a tool holder is moved back and forth in an oscillating manner in the direction of the impact axis, and in a hammer drilling operation, in which the tool also performs a rotating movement around the impact axis.
  • vibrations or accelerations arise during drilling or chiseling operations due to an interaction between a surface and the tool connected to the tool holder.
  • the greatest accelerations act in the impact axis direction or longitudinal direction or Z direction.
  • vibrations Due to an angular design of the machine tool in which the center of mass of the assembly is not on the impact axis, vibrations also occur in the vertical direction transverse to the impact axis or in the Y direction when the machine tool is in operation.
  • vibrations in the transverse direction or X direction also arise during operation of the machine tool, such as those caused, for example, by unbalance forces of the drive device.
  • a user who holds the machine tool for example in at least one grip area, in particular the grip area, can easily be set to a very low value during operation of the machine tool, which allows a long working time with a machine tool according to the invention.
  • the three spatial directions are defined in particular by a longitudinal direction, a transverse direction and a vertical direction of the machine tool.
  • the longitudinal direction or Z direction The transverse direction or X direction and the vertical direction or Y direction are perpendicular to one another, with the longitudinal direction corresponding to an impact axis.
  • a plane spanned by the transverse direction and the vertical direction is perpendicular to the longitudinal direction.
  • the rear decoupling device has a first decoupling device which has spring properties and/or damping properties in a transverse direction and a vertical direction of the machine tool, and a second decoupling device is provided which has spring properties and/or damping properties in the longitudinal direction. It has been shown that with such a design, particularly good damping properties can be achieved in all operating states and thus advantageously low vibrations affecting a user in one operation. It is particularly advantageous if the first decoupling device additionally has spring properties and/or damping properties in the longitudinal direction.
  • the first decoupling device has a decoupling element that extends on the circumference to an axis of the decoupling device that runs in the longitudinal direction. With such a decoupling element, spring and/or damping properties in the transverse direction and the vertical direction can be easily adjusted.
  • the decoupling element has a cross section that is constant in the circumferential direction of the axis or a cross section that varies in the circumferential direction of the axis.
  • This allows essentially identical spring and/or damping properties to be set in the vertical and transverse directions.
  • different spring and/or damping properties in the vertical and transverse directions can be set in a simple manner depending on the application by varying the cross section of the decoupling element in the circumferential direction.
  • the decoupling element has a varying material thickness in the circumferential direction.
  • the decoupling element can be designed, for example, with an elastomer, in particular with a dynamic foam. In principle, any materials with desired spring and/or damping properties can be used.
  • the first decoupling device has an element which is operatively connected to the housing and which is in the Essentially displaceable in the longitudinal direction relative to an element operatively connected to the assembly.
  • the housing-fixed pin is designed as a steel pin, which is connected, in particular screwed, to the housing in a form-fitting manner, whereby the element operatively connected to the assembly can be designed, for example, as a sliding bushing that represents a sliding partner for this.
  • an element is operatively connected to the structural unit and can be displaced substantially in the longitudinal direction relative to an element operatively connected to the housing.
  • the element operatively connected to the housing or the element operatively connected to the assembly can be pretensioned to the housing or the assembly by means of the decoupling element be connected.
  • the first decoupling device is arranged in an area facing away from a tool holder of the machine tool between the housing and the assembly and, in particular, is placed at a particularly large distance from the front decoupling device arranged in the area of a tool holder.
  • the arrangement of the first decoupling device can be arranged in any position between the housing and the assembly.
  • the rear decoupling device has at least two first decoupling devices, in particular of essentially identical design, which are arranged at different positions between the housing and the assembly. This makes it possible to achieve particularly favorable spring and/or damping properties.
  • a position and a number of the first decoupling devices can basically be selected arbitrarily depending on the application.
  • the rear decoupling device has at least a first decoupling device, a second decoupling device and a third decoupling device, each of which is arranged between the assembly and the housing, the first decoupling device having spring properties and/or damping properties in a vertical direction of the machine tool has, wherein the second decoupling device has spring properties and / or damping properties in a transverse direction of the machine tool, and wherein the third decoupling device has spring properties and/or damping properties in the longitudinal direction. It has been shown that particularly favorable spring and/or damping properties can be achieved in this way. All decoupling devices can additionally have spring and/or damping properties in further directions. Furthermore, all decoupling devices can enable movement of the assembly and the housing in further directions relative to one another in addition to the direction in which their spring and/or damping properties act.
  • the first decoupling device has two sliding elements connected essentially in the vertical direction by means of at least one spring device, in particular by means of at least two spring devices, which are mounted in a guide fixed to the housing.
  • the sliding elements are preferably mounted in such a way that the assembly can be displaced in the longitudinal direction relative to the housing by the sliding elements. If at least two spring devices are provided, a rotational movement of the assembly relative to the housing, in particular in the transverse direction, is also possible via the spring devices.
  • at least one, in particular two, limiting elements can be provided which limit a movement of the sliding elements relative to one another in the vertical direction.
  • the second decoupling device has a decoupling element which runs circumferentially with respect to an axis running in the transverse direction and which is arranged on an element mounted opposite the assembly, the element being guided on an element fixed to the housing .
  • the front decoupling device enables the assembly to move relative to the housing in all three spatial directions.
  • the front decoupling device can be designed as a plain bearing with a clearance fit.
  • the front decoupling device can have a first sliding element fixed to the housing and a second sliding element which interacts with the assembly, the sliding element operatively connected to the assembly being relative to the Longitudinal direction is biased in the radial direction.
  • the preload can be achieved, for example, via an annular element running circumferentially with respect to the longitudinal direction or via a bend of the sliding element operatively connected to the assembly that points in the radial direction with respect to the longitudinal direction.
  • a housing-fixed sliding element of the front decoupling device can be designed with great rigidity so that the housing-fixed sliding element is not deformed or not deformed to an undesirably large extent, for example when a handle device is connected to the outside by means of a tension band.
  • the sliding element fixed to the housing can be designed, for example, with a metallic material, in particular as a steel bushing.
  • the sliding element operatively connected to the assembly can be made of a plastic and the sliding element fixed to the housing can be made of a metallic material.
  • the sliding element operatively connected to the assembly can be designed as a so-called Slydring® or as a ring slotted in the circumferential direction, in particular a steel ring or plastic ring, in particular with a sliding varnish coating.
  • the front decoupling device has a first sliding element fixed to the housing, a second sliding element fixed to the assembly and a third sliding element, wherein the third sliding element is displaceable substantially in the longitudinal direction relative to the second sliding element fixed to the assembly, and wherein the first sliding element has a has a sliding surface curved in the longitudinal direction, which is designed to correspond to a sliding surface of the third sliding element, wherein by interaction of the sliding surface of the first sliding element with the sliding surface of the third sliding element, the assembly can be rotated substantially about a transverse direction and / or about a vertical direction relative to the housing .
  • Such a design of the front decoupling device enables, in particular, a large displacement of the assembly relative to the housing in the longitudinal direction and a rotation of the assembly relative to the housing in the area of the front decoupling device in the transverse direction and/or in the vertical direction.
  • the third sliding element can be designed in several parts in the circumferential direction, in particular two, three, four or further parts, in order to facilitate assembly of the third sliding element, in particular on the first sliding element.
  • the individual ones can be used Parts have grooves on the inside with end regions widened in the circumferential direction, via which adjacent parts of the third sliding element can be connected to one another via connecting elements.
  • At least one support device arranged in the transverse direction between the assembly and the housing is provided, the support device having a support element prestressed in the transverse direction.
  • the support device represents a decoupling device, by means of which oscillations and/or vibrations that occur in the area of the assembly, in particular during operation of the machine tool, are dampened and are transmitted to the housing to a lesser extent.
  • rattling of the assembly can be achieved by arranging such a support device on both sides, particularly in the transverse direction, between the assembly and the housing in this area, and a displacement of the assembly relative to the housing in the vertical direction is also easily possible.
  • An embodiment with low friction provides that the support device has a metallic support element which is arranged fixed to the housing and which interacts with a plastic element of the assembly. A function reversal is also possible.
  • stops arranged on both sides of the housing and/or the assembly can be provided in all directions, whereby the number and position of the stops can be varied in any direction depending on the application.
  • Fig. 1 to Fig. 5 show a first embodiment of a machine tool 1, which is designed here as a hammer drill or combination hammer, but in an alternative embodiment can also be designed as a chisel hammer or the like.
  • the machine tool 1 is designed as a wireless machine tool with an accumulator 3; in an alternative embodiment, it can be provided for mains operation.
  • the machine tool 1 is designed here in an angular design and has a housing 5 which has a rear handle area 7 in a D-shape.
  • the housing 5, which is one or can be made in several parts, is here firmly connected to the handle area 7 that can be grasped by a user.
  • the housing 5 is divided in the longitudinal direction Z and designed in a so-called pot design.
  • the housing 5 can also have two housing halves that can be connected to one another in the transverse direction X and can be designed in a so-called shell design.
  • a structural unit or assembly 9 Arranged within the housing 5 is a structural unit or assembly 9, which has a conventionally designed percussion mechanism 11 and a drive device 13 designed as an electric motor, which is designed to drive the percussion mechanism 11.
  • the assembly 9 is L-shaped.
  • a drilling or chiseling operation is possible by means of the assembly 9, with the tool 17 moving back and forth in an oscillating manner in a striking axis direction in the chiseling operation.
  • the tool In the drilling or hammer drilling operation, the tool also performs a rotating movement around the impact axis.
  • the machine tool 1 has, in a conventionally known manner, a tool holder 16, via which a tool 17, for example a chisel or the like, can be detachably and operatively connected to the structural unit 9.
  • the figures also show a longitudinal direction designated Z or Z direction, a vertical direction designated Y or Y direction and a transverse direction designated X or X direction.
  • X, Y and Z are axes of a Cartesian coordinate system and are each perpendicular to one another. Without the action of an external force, the longitudinal direction Z is congruent with the impact axis, which is defined by a central axis of the tool or the tool holder 16.
  • 15 shows a center of gravity of the structural unit 9, which is arranged below the longitudinal direction Z with respect to the vertical direction Y in the illustrations shown and is therefore spaced from the longitudinal direction Z.
  • the structural unit 9 can have a separate inner housing 21, which in particular includes the impact mechanism 11 and the drive device 13 or within which the impact mechanism 11 and the drive mechanism 13 are in particular arranged almost completely.
  • a front decoupling device 23 and a rear decoupling device 25 are shown, which can basically be designed with one decoupling device or several decoupling devices.
  • the front decoupling device 23 is in front of the rear one in the longitudinal direction Z
  • Decoupling device 25 is arranged, ie closer to the tool holder 16 and in an area facing away from the rear handle area 7.
  • a front handle area 27 or side handle can be seen, which in the present case can be detachably brought into operative connection with the housing 5 in the area of the front decoupling device 23, for example by means of a tension band.
  • the front handle area 27 extends essentially in the transverse direction
  • the structural unit 9 is mounted relative to the housing 5 via both the front decoupling device 23 and the rear decoupling device 25, the structural unit 9 relative to the housing 5 both in the area of the front decoupling device 23 and in the area of the rear decoupling device 25 both in the longitudinal direction Z , can be moved in the transverse direction X as well as in the vertical direction Y.
  • the displacement possibility s in the longitudinal direction Z is, for example, a maximum of approximately 10 mm, but can also be up to 20 mm or larger in other designs.
  • the number and position of the stops 37 can basically be freely selected, preferably at least one, in particular two, stops 37 being provided on both sides of the structural unit 9 for each direction X, Y and Z.
  • the interaction between a surface to be machined and the tool 17 creates vibrations or accelerations that mainly act in the direction of the impact axis. Due to the angular design of the machine tool 1, in which the center of mass 15 of the structural unit 9 is not on the impact axis or longitudinal axis Z, this also results in vibrations or accelerations transverse to the impact axis in the vertical direction Y. For example, due to unbalance forces in the area of the drive device 13 During operation of the machine tool 1 there are also vibrations or accelerations in the transverse direction X.
  • vibrations and accelerations occur in the area of the structural unit 9. These can be done via the front decoupling device 23 and the rear Decoupling device 25 is transferred to the housing 5 having the front handle area 27 and the rear handle area 7.
  • the aim is to use the decoupling devices 23, 25 to reduce or dampen as much as possible the vibrations or accelerations that arise during operation of the machine tool 1 in the area of the structural unit 9.
  • Assembly 9 is in Fig. 1 shown in the rest position in which the machine tool 1 is not operated or in which the assembly 9 is in the front end position in contact with the front stop 37a.
  • Fig. 2 the assembly 9 is shown in the rear end position and with the maximum deflection in the longitudinal direction Z, in which the assembly 9 is at the stops 37b and 37c.
  • a first lateral stop 37d and a second lateral stop 37e are provided, which limit a movement path of the assembly 9 relative to the housing 5 in the transverse direction X.
  • an upper stop 37f and a lower stop 37g are provided, which limit a movement path of the assembly 9 relative to the housing 5 in the vertical direction Y.
  • the rear decoupling device 25 will first be described in more detail below.
  • the rear decoupling device 25 has two first decoupling devices 31, 33 and a second decoupling device 35.
  • the second decoupling device 35 of the rear decoupling device 25 has spring properties and/or damping properties in the longitudinal direction Z and is designed here as a spring device with an axis of action essentially in the longitudinal direction Z.
  • the spring device 35 designed here as a cylindrical coil spring, presses the assembly 9 relative to the housing 5 Fig. 1 into the front end position in which the assembly 9 rests against the front stop 37a. In Fig. 2 the spring device 35 is shown in a maximally tensioned position. The spring device 35 assumes this when the assembly 9 is in the rear end position relative to the housing 5, in which the assembly rests on the rear stops 37b, 37c.
  • spring devices 35 can also be provided, for example two spring devices 35 arranged at a distance from one another in the transverse direction X can be provided. Alternatively or in addition to this, two spring devices 25 arranged at a distance from one another in the vertical direction Y can also be provided.
  • first decoupling devices 31, 33 which are essentially identical to one another, are provided, with the first decoupling device 31 on a left side of the machine tool 1 between the assembly 9 and the housing 5 and the first decoupling device 33 on a right side of the machine tool 1 between the assembly 9 and the housing 5 is arranged.
  • only one such first decoupling device 31, 33 can be provided, which is arranged at any position between the assembly 9 and the housing 5. It is particularly advantageous if a distance between a decoupling device 29 of the front decoupling device 23 and the first decoupling device 31 and / or 33 of the rear decoupling device 25 in the longitudinal direction Z is as large as possible.
  • Fig. 4 and Fig. 5 is shown in a greatly exaggerated manner that the assembly 9 can rotate relative to the housing 5 during operation of the machine tool 1 both about an axis running in the transverse direction X and about an axis running in the vertical direction Y.
  • a rotation about an axis running in the longitudinal direction Z is also possible.
  • the front decoupling device 23 and the rear decoupling device 25 are designed in such a way that they enable such rotations and in particular can also dampen vibrations or accelerations transmitted thereby.
  • FIG. 1 to Fig. 5 A further first decoupling device 36 is also shown, which is arranged in a lower region of the machine tool 1 in the vertical direction Y between the assembly 9 and the housing 5.
  • the further first decoupling device 36 is optional and can improve spring and/or damping properties if necessary.
  • the rear decoupling device 25 has a single first decoupling device 31 in addition to two second decoupling devices 35 designed as spring devices.
  • the first decoupling device 31 according to Fig. 6 to Fig. 9 corresponds to the structure of the first decoupling devices 31 and 33 Fig. 1 to Fig. 5 .
  • the first decoupling device 31 has a first sliding element 39, which is designed here as a pin-shaped element with a central axis 49.
  • the pin-shaped element 39 which is designed, for example, as a steel pin, is connected to the housing 5 in a form-fitting manner by means of a screw connection via a thread 41 arranged in the longitudinal direction Z in the rear end region.
  • the first decoupling device 31 also has a second sliding element 43 which interacts with the first sliding element 39 and serves as a sliding partner for this purpose on, which in the present case is designed as a sliding bushing.
  • the sliding bushing 43 interacts via a decoupling element 45 with a bearing block 47 fixed to the assembly. In the present case, the bearing block 47 is connected to a gear housing of the assembly 9 via a positive connection.
  • the decoupling element 45 is fixed here in the direction of the central axis 49 relative to the sliding bushing 43.
  • the sliding bushing 43 which is made in particular with plastic, is preferably clipped into the decoupling element 45.
  • the decoupling element is fixed in the direction of the central axis 49 via a bushing 51 and the bearing block 47.
  • decoupling element 45 is glued to the sliding bush 43 and/or to the bearing block 47.
  • the decoupling element 45 is here tubular with a substantially constant wall thickness. In an alternative embodiment, the decoupling element 45 can have a varying wall thickness on the circumference of the central axis 49.
  • the decoupling element 45 is designed with an elastomer. In the in Fig. 8 In the rest position shown, the decoupling element 45 has a preload in the radial direction of the central axis 49 in order to achieve a desired radial rigidity in the transverse direction X and vertical direction Y.
  • the assembly 9 can be rotated relative to the housing 5.
  • 47 spring receiving mandrels are attached to the bearing block for an upper spring device 33 designed as a compression spring in the vertical direction Y.
  • two front stops 37a are provided, which are designed as rubber buffers and are connected to the gearbox housing.
  • a further essentially identical first decoupling device can also be provided, in a lower region with respect to the vertical direction Y and in a rear region with respect to the longitudinal direction Z of the assembly 9.
  • a further first decoupling device can be arranged in the area of the drive device 13.
  • a first decoupling device 53 is designed with an asymmetrical sheet metal spring or leaf spring 55, which is preferably coated with anti-friction varnish.
  • One with that Steel pin 57 connected to the housing 9 serves as a sliding partner for the leaf spring 55, the leaf spring 55 encompassing the steel pin 57 at least in some areas in an end region.
  • the leaf spring 55 is arranged on the assembly 9 by means of a bearing block 59, the bearing block 59 in the present case having two spring mandrels 61a, 61b for interacting with two spring devices 33.
  • a first lateral support device 63 and a second lateral support device 65 are shown.
  • the first lateral support device 63 and the second lateral support device 65 are essentially symmetrical and structurally identical to one another, with the first lateral support device 63 being described below as representative of the second lateral support device 65.
  • the support devices 63, 65 can represent part of the rear decoupling device 25 and can therefore also be decoupling devices which serve to dampen the movement of the housing 5 relative to the assembly 9 during operation of the machine tool 1.
  • the first lateral support device 63 is arranged in the transverse direction X between the assembly 9 and the housing 5.
  • the first lateral support device 63 has a support element 67 prestressed in the transverse direction
  • the sliding plate 69 is, for example, glued to the support element 67 and extends essentially in the vertical direction Y and is intended to cooperate with a second sliding element 71, which in the present case is formed by a housing 73 of the drive device 13 made of plastic.
  • the first and second lateral support devices 63, 65 can safely absorb large forces that occur during operation between the assembly 9 and the housing 5 and hard stops that can lead to rattling be avoided.
  • the elastic mounting in the transverse direction X which is slightly preloaded in the transverse direction X, so that no play between the assembly 9 and the housing 5 in the transverse direction
  • a first embodiment of the decoupling device 29 of the front decoupling device 23 is shown in more detail.
  • the front decoupling device 29 has a first sliding element 75 fixed to the housing and a second sliding element 77 which interacts with the assembly 9.
  • the second sliding element 77 is arranged in a groove 79 of the assembly and is essentially fixed in the longitudinal direction Z relative to the assembly.
  • the second sliding element 77 is biased in the radial direction with respect to the longitudinal direction Z.
  • a further groove 81 is provided in the radial direction within the groove 79, in which an O-ring 83 is arranged.
  • the O-ring 83 applies a force acting outwards in the radial direction to the second sliding element 77.
  • the first sliding element 75 is designed here as a steel bushing and is positively connected to the housing 5.
  • the steel bushing 75 is made so solid that it counteracts to the desired extent any deformation of the housing 9 in the area of the front handle area 27 by connecting it by means of a tension band and counteracts the non-uniform circumferential forces present.
  • the second sliding element 77 is designed with a slotted tubular ring made of plastic.
  • the second sliding element 77 is preferably designed as a so-called Slydring® .
  • the selected material pairing of the first sliding element 75 and the second sliding element 77 achieves good sliding properties, which enables the sliding elements 75 and 77 to be displaced relative to one another during operation, particularly in the longitudinal direction Z.
  • the interaction of the O-ring 83 and the second sliding element 77 enables the assembly 9 to be rotated relative to the housing 5 in this area.
  • FIG. 14 to Fig. 16 an alternatively designed decoupling device 85 of the front decoupling device 23 is shown.
  • the decoupling device 85 has the first sliding element 75 and a second sliding element 87, which is designed here as a coated, slotted steel spring ring.
  • the steel spring ring 87 is guided in the groove 79 of the assembly 9 and is fixed in particular in the longitudinal direction Z.
  • the steel spring ring 87 is bent in the longitudinal direction Z and rests with its end regions in the longitudinal direction Z in the groove 79 and in a central region in the longitudinal direction Z on the first sliding element 75.
  • the middle region of the second sliding element 87 lies against the first sliding element 75 and slides in the longitudinal direction Z when the assembly 9 is displaced relative to the housing 5 this one.
  • the second sliding element 87 preferably has a sliding varnish coating to improve sliding properties.
  • the steel spring ring 87 is prestressed in the radial direction, with a radial rigidity being adjustable via a thickness of the sheet metal.
  • FIG. 17 an alternative embodiment of a second sliding element 89 is shown, in which a plurality of recesses 90 are present all around in both end regions.
  • a radial rigidity of the second sliding element 89 can be easily adjusted to the desired extent.
  • Fig. 18 to Fig. 23 an alternatively designed machine tool 91 is shown, which is basically designed to be comparable to the machine tool 1. In the following, the differences to the machine tool 1 will essentially be discussed and otherwise reference will be made to the comments on the machine tool 1.
  • the front decoupling device 23 has a decoupling device 93, which has a first sliding element 95 fixed to the housing, a second sliding element 97 fixed to the module and a third sliding element 99.
  • the first sliding element 95 is designed as a socket and is positively connected to the housing 5.
  • the first sliding element 95 is preferably made of a metallic material.
  • the first sliding element 95 has, in a central region in the longitudinal direction Z, a circumferentially extending curved recess 101, which is intended to cooperate with the third sliding element 99 and forms an inner surface 102.
  • the second sliding element 97 is part of the assembly 9 and has a hollow cylindrical area 103.
  • the second sliding element 97 is preferably made of a metallic material.
  • the third sliding element 99 has three parts 105, 107, 109, which in the present case are designed to be essentially identical to one another.
  • the parts 105, 107, 109 are each designed as a segment of a tube and have an inner surface 111 which points inwards in the radial direction with respect to the longitudinal direction Z and is part of a circular cross section with a constant radius in the longitudinal direction Z.
  • An outer surface 113 of the parts 105, 107, 109, which whitens outwards in the radial direction with respect to the longitudinal direction, is designed to be spherical and has a curvature with a constant radius in the transverse direction X with respect to the longitudinal direction Z.
  • the third sliding element 99 is preferably made of plastic.
  • the parts 105, 107, 109 each have a groove 115, 117 in outer regions in the circumferential direction, the grooves 115, 117 having an increased width in the longitudinal direction in their region pointing in the circumferential direction towards an end region of the respective part 105, 107, 109 have Z.
  • the parts 105, 107, 109 can each be connected to one another via connecting elements 119, which are each inserted into grooves 115, 117 of adjacent parts 105, 107, 109.
  • the first sliding element 95 is first connected to the housing 5 in a form-fitting manner.
  • the three parts 105, 107, 109 of the third sliding element 99 are then inserted into the curved recess 101 of the first sliding element 95 and connected to one another via the connecting elements 119.
  • the second sliding element 97 can be inserted with the assembly on the inside in the longitudinal direction Z.
  • the second sliding element 97 and the third sliding element 99 form a sliding pairing that enables the assembly 9 to be displaced in the area of the decoupling device 93 in the longitudinal direction Z relative to the housing 5. Friction is advantageously low due to the selected material pairing.
  • Two parts 105, 107, 109 of the third sliding element 99 which are adjacent in the circumferential direction are slightly spaced apart from one another in the circumferential direction. This distance between the second sliding element 97 and the third sliding element 99 enables the assembly 9 to rotate relative to the housing 5 in the area of the decoupling device 93 about the transverse direction X and the vertical direction Y.
  • the rear decoupling device 25 of the machine tool 91 in the present case has two first decoupling devices 121, 123, in the present case two second decoupling devices 125, 127 and a third decoupling device 129.
  • first decoupling devices 121 and 123 are provided, which are designed essentially mirror-symmetrically to a longitudinal center plane formed by the longitudinal direction Z and the vertical direction Y.
  • the first decoupling device 121 assigned to the left side is described below as a representative of the first decoupling device 123 assigned to the right side.
  • the first decoupling device 121 has spring properties and/or damping properties in the vertical direction Y of the machine tool 91.
  • the first decoupling device 121 has two sliding elements 131, 133, which in the basic position are spaced apart from one another in the vertical direction Y, with two spring devices 135, 137 being arranged at a distance from one another in the longitudinal direction Z, which hold the sliding elements 131, 133 with one in the vertical direction Push apart using force Y.
  • the sliding elements 131, 133 can be displaced relative to one another in the vertical direction Y against a spring force of the spring devices 135, 137 and can be rotated relative to one another about the transverse direction X.
  • the sliding elements 131, 133 each have wedge-shaped surfaces 140 in their end regions pointing in the longitudinal direction Z.
  • a bearing 139 connected to the assembly 9 is provided, each of which has an angle profile 141, 143 spaced apart from one another in the longitudinal direction Z. It can be provided that a sliding element 131, 133, for example the lower sliding element 131 in the vertical direction Y, is firmly connected to the assembly 9. It can also be provided that both sliding elements 131, 133 are loosely connected to the bearing 139.
  • An angle profile 141 or 143 arranged in an end region interacts with a wedge-shaped surface 140 of the first sliding element 131 and a wedge-shaped surface 140 of the second sliding element 133 and limits a maximum distance between the sliding elements 131, 133 in the vertical direction Y.
  • the spring devices 135, 137 are designed in such a way that the sliding elements 131, 133 act on the maximum spacing in the vertical direction Y with a force acting outwards in the vertical direction Y.
  • a guide 145 fixed to the housing which has a guide channel 147 pointing essentially in the longitudinal direction Z.
  • the guide 145 is preferably made of a metallic material.
  • the guide channel 147 has an extension in the vertical direction Y, which essentially corresponds to a maximum extension of surfaces of the sliding elements 131, 133 pointing outwards in the vertical direction Y.
  • the guide channel 147 is designed in such a way that it prevents or greatly limits movement of the sliding elements 131, 133 relative to the guide 145 in the transverse direction X.
  • the angle profiles 141, 143 are designed in such a way that during operation they do not hinder the movement of the sliding elements 131, 133 relative to one another to the desired extent through a movement of the assembly 9 relative to the housing 5 and through interaction with the guide 145.
  • two second decoupling devices 125 and 127 are provided, which are designed essentially mirror-symmetrically to a longitudinal center plane formed by the longitudinal direction Z and the vertical direction Y.
  • the following is the one assigned to the left side second decoupling device 125 is described as representative of the second decoupling device 127 assigned to the right side.
  • the second decoupling device 125 has spring and/or damping properties in the transverse direction X of the machine tool.
  • the second decoupling device 125 has a displacement element 151, which in the present case has a pin-shaped region 153 and a substantially plate-shaped end region 155. In an end region facing away from the plate-shaped end region 155, the displacement element 151 has a shoulder 159.
  • the pin-shaped region 153 has an axis 157 extending essentially in the transverse direction X.
  • a hollow cylindrical decoupling element 149 is arranged directly on the pin-shaped area 153.
  • the decoupling element 149 is arranged in the longitudinal direction of the axis 157 between the plate-shaped end region 155 and the shoulder 159 and is preferably biased in the longitudinal direction of the axis 157.
  • the decoupling element 149 projects outwards beyond the shoulder in the area of the shoulder 159 in the radial direction of the axis 157 and acts in this area with a bearing 161 fixed to the module, in the present case both in the radial direction of the axis 157 and in the direction of the axis 157 with the bearing 161 together.
  • the displacement element 151 interacts by means of the plate-shaped region 155 with a here metallic guide 163, which is arranged on the housing 5.
  • the displacement element 151 and the guide 163 rest against each other in the transverse direction
  • the interaction of the guide 163 with the displacement element 151 allows the assembly 9 to be displaced relative to the housing 5 in the longitudinal direction Z and in the vertical direction Y through a sliding movement.
  • the third decoupling device 129 is essentially comparable to the second decoupling device 33 of the machine tool 1 and is designed as a spring device with spring and/or damping properties in the longitudinal direction Z.
  • the assembly 9 can be displaced in the area of the rear decoupling device 25 in the longitudinal direction Z, in the transverse direction X and in the vertical direction Y relative to the housing 5, with movements the assembly 9 relative to the housing 5 in the longitudinal direction Z and in the transverse direction X and are damped particularly favorably in the vertical direction Y, so that vibrations acting on a user during operation of the machine tool 91 are advantageously low.
  • the rear decoupling device 25 only has the first decoupling devices 121, 123 and the third decoupling device 129 and no second decoupling devices 125, 127. This can be particularly advantageous for machine tools 91 that only have chisel operation.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Percussive Tools And Related Accessories (AREA)
EP22192588.6A 2022-08-29 2022-08-29 Machine-outil avec un dispositif de découplage Withdrawn EP4331774A1 (fr)

Priority Applications (4)

Application Number Priority Date Filing Date Title
EP22192588.6A EP4331774A1 (fr) 2022-08-29 2022-08-29 Machine-outil avec un dispositif de découplage
EP23751924.4A EP4580837A1 (fr) 2022-08-29 2023-08-02 Machine-outil dotée d'un dispositif de découplage
CN202380050436.9A CN119403651A (zh) 2022-08-29 2023-08-02 具有解耦装置的机械工具
PCT/EP2023/071436 WO2024046695A1 (fr) 2022-08-29 2023-08-02 Machine-outil dotée d'un dispositif de découplage

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP22192588.6A EP4331774A1 (fr) 2022-08-29 2022-08-29 Machine-outil avec un dispositif de découplage

Publications (1)

Publication Number Publication Date
EP4331774A1 true EP4331774A1 (fr) 2024-03-06

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Family Applications (2)

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EP22192588.6A Withdrawn EP4331774A1 (fr) 2022-08-29 2022-08-29 Machine-outil avec un dispositif de découplage
EP23751924.4A Pending EP4580837A1 (fr) 2022-08-29 2023-08-02 Machine-outil dotée d'un dispositif de découplage

Family Applications After (1)

Application Number Title Priority Date Filing Date
EP23751924.4A Pending EP4580837A1 (fr) 2022-08-29 2023-08-02 Machine-outil dotée d'un dispositif de découplage

Country Status (3)

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EP (2) EP4331774A1 (fr)
CN (1) CN119403651A (fr)
WO (1) WO2024046695A1 (fr)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP4684919A1 (fr) 2024-07-23 2026-01-28 Hilti Aktiengesellschaft Machine-outil avec un module en saillie
EP4684920A1 (fr) 2024-07-23 2026-01-28 Hilti Aktiengesellschaft Machine-outil à guidage linéaire décalé
EP4714607A1 (fr) 2024-09-19 2026-03-25 Hilti Aktiengesellschaft Machine-outil avec connexion par enfichage
EP4714606A1 (fr) 2024-09-19 2026-03-25 Hilti Aktiengesellschaft Machine-outil avec dispositif de découplage positionné en haut
EP4714604A1 (fr) 2024-09-19 2026-03-25 Hilti Aktiengesellschaft Machine-outil avec bouton rotatif de sélection de mode de fonctionnement pouvant être accouplé
EP4714605A1 (fr) 2024-09-19 2026-03-25 Hilti Aktiengesellschaft Machine-outil avec bras oscillant

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH666216A5 (de) * 1984-02-18 1988-07-15 Bosch Gmbh Robert Handwerkzeugmaschine, insbesondere bohr- oder schlaghammer.
EP1958735A1 (fr) * 2007-02-15 2008-08-20 HILTI Aktiengesellschaft Machine-outil
DE102020216538A1 (de) 2020-12-23 2022-06-23 Robert Bosch Gesellschaft mit beschränkter Haftung Handwerkzeugmaschine

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH666216A5 (de) * 1984-02-18 1988-07-15 Bosch Gmbh Robert Handwerkzeugmaschine, insbesondere bohr- oder schlaghammer.
EP1958735A1 (fr) * 2007-02-15 2008-08-20 HILTI Aktiengesellschaft Machine-outil
DE102020216538A1 (de) 2020-12-23 2022-06-23 Robert Bosch Gesellschaft mit beschränkter Haftung Handwerkzeugmaschine

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP4684919A1 (fr) 2024-07-23 2026-01-28 Hilti Aktiengesellschaft Machine-outil avec un module en saillie
EP4684920A1 (fr) 2024-07-23 2026-01-28 Hilti Aktiengesellschaft Machine-outil à guidage linéaire décalé
WO2026021798A1 (fr) 2024-07-23 2026-01-29 Hilti Aktiengesellschaft Machine-outil dotée d'un ensemble en saillie
WO2026021805A1 (fr) 2024-07-23 2026-01-29 Hilti Aktiengesellschaft Machine-outil à guide linéaire décalé
EP4714607A1 (fr) 2024-09-19 2026-03-25 Hilti Aktiengesellschaft Machine-outil avec connexion par enfichage
EP4714606A1 (fr) 2024-09-19 2026-03-25 Hilti Aktiengesellschaft Machine-outil avec dispositif de découplage positionné en haut
EP4714604A1 (fr) 2024-09-19 2026-03-25 Hilti Aktiengesellschaft Machine-outil avec bouton rotatif de sélection de mode de fonctionnement pouvant être accouplé
EP4714605A1 (fr) 2024-09-19 2026-03-25 Hilti Aktiengesellschaft Machine-outil avec bras oscillant
WO2026062104A1 (fr) 2024-09-19 2026-03-26 Hilti Aktiengesellschaft Machine-outil ayant une bascule de palier
WO2026062099A1 (fr) 2024-09-19 2026-03-26 Hilti Aktiengesellschaft Machine-outil dotée d'un dispositif de découplage positionné au sommet
WO2026062100A1 (fr) 2024-09-19 2026-03-26 Hilti Aktiengesellschaft Machine-outil à bouton rotatif de sélection de mode de fonctionnement pouvant être accouplé
WO2026062101A1 (fr) 2024-09-19 2026-03-26 Hilti Aktiengesellschaft Machine-outil ayant une liaison enfichable

Also Published As

Publication number Publication date
CN119403651A (zh) 2025-02-07
WO2024046695A1 (fr) 2024-03-07
EP4580837A1 (fr) 2025-07-09

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